Time ago I bought this Diprotim timer on eBay. It was announced as complete with instructions, when arrived it really was like new, in box, but no intructions sheet. The seller issued a full refund and told me to keep the timer. I've figured out most of its functions and can use it, but there are two buttons I really don't understand what are they for. These buttons are marked "E" and "X". I know there are a couple of places that offer to send a photocopy of the instruction booklet (two pages) for around US$15, but all that I want is to know what these buttons do. Any help?